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25.
Picos are online computers
• persistent—retain state based on past operations.
• unique—identity that is immutable.
• online—available on the Internet and respond to events and
queries.
• concurrent—operate independently of one another and process
events and queries asynchronously.
• event-driven—respond to events by changing state and sending
new events.
• rule-based—behavior is expressed as rules that pattern-match
against incoming events.

76.
Modules are NOT CGI Programs
• Modules run inside the Apache process architecture
• Modules have access to and can replace all Apache services
• Uses the server API - not an embedded interpreter
• Access to every part of the HTTP request lifecycle